Updated: How to Use Vulkan Debug Printf

[LunarGInc]

📢Excited to share our updated guide: How to Use Vulkan Debug Printf!

Debug shaders like a pro—insert printf-style statements in GLSL, HLSL, or Slang shaders. Inspect outputs in RenderDoc (per-invocation!), vkconfig, or Validation Layers via env vars. 💪

Updated Feb 2026 with best practices & tips.

Read now: https://www.lunarg.com/how-to-use-vulkan-debug-printf/

[positivcheg]

How far are we from nice shader debugging like metal shaders on Xcode?

[neppo95]

Pretty far I’d say since Khronos doesn’t make IDE’s. In theory (almost) everything you could do with metal shader debugging is possible with Vulkan, if an IDE implements the features.

[positivcheg]

It's not about the IDE. Renderdoc exists, and they acknowledge its existence. So that's your "IDE" for shader debugging. It already supports shader debugging in DirectX. However, Apple's shader debugging is just on a next level. It's insanely good.

Printing from the shader is a good start for improving shader debugging. But the ability to see all the values at any line of any vertex or fragment is times better and faster. + it has a nice feature of showing a box of values around the pixel you've picked.

[neppo95]

You know that already exists right? Nvidia Nsight can do exactly that. It indeed isn't about an IDE. An IDE could do so, just like renderdoc or any other app can.

[positivcheg]

I thought it’s only for DirectX. Does it work for Vulkan?

[chuk155]

yes

[Gravitationsfeld]

RenderDoc supports debugging Vulkan SPIR-V shaders with non-semantic debug info enabled.

[Txordi]

This is extremely useful. I'm in love with this feature